STROPHOCHEILUS-BORUS. 25 



with a slight thickening within, above the middle; columella short, 

 very concave and pink helow, broadly spreading in a translucent- 

 white callus over the umbilical tract and parietal wall, usually with 

 a thickening (hardly a lump) above, remote from edge of callus. 



Alt. 128, diam. 80; aperture alt. 69, width 54 mill. 



Alt. 116, diara. 62; aperture alt. 59 width 44 mill. 



Rio Janeiro (Martens et a/.) ; New Freiburg (Bescke) ; St. Sebas- 

 tiano, on the coast S. of Rio (Spix) ; Prov. Baliia (Spix) ; Bahia 

 (Anthony) ; near Petropolis (A. D. Brown). 



Helix ovata MULLER, Hist. Verm, ii, p. 85. Helix ovalis GMEL., 

 Syst. Nat. 13, p. 3637. If. (Cochlogend) ovata FER., Hist. pi. 146, 

 147. Bulimus ovatus BRUG., Encycl. Meth. i, p. 318. PFR., Mon- 

 ogr. ii, p. 19. REEVE, C. Icon. f. 212. MARTENS, Novit. Conch, v, 

 p. 14. HIDALGO, Viaje al Pacif. p. 47. B. ovum H. & A. AD., Gen. 

 Rec. Moll, ii, p. 146. B. hcemastomus SWAINS., Malacol. p. 178, fig. 26. 

 Strophocheilus hcemastomus SPIX, Test. Brasil. p. 12, pi. 11, f. 1. 



This is one of the best-known species, readily recognized in typical 

 specimens by the strong, glossy, rich dark chestnut epidermis with 

 numerous darker and yellowish streaks, the narrow aperture, rather 

 straight, pink or pink-edged outer lip, translucent edged parietal 

 callus, always thinned-out at the edge, etc. Moreover, the lip is 

 broadly reflexed, recurved ; and the columella is narrowly, abruptly 

 curved toward its base, and the broad spread of its reflexion extends 

 lower than in other forms. A very sparce, minute granulation 

 sometimes extends over the earlier half of the body-whorl. 



Vtir. chionostomus Morch. PI. 21, fig. 49. 



Form, sculpture and marking exactly as in the type, or shell 

 somewhat more lengthened ; but cuticle thinner, yellow with dark 

 stripes ; peristome snow-white (whence the name) ; shell-substance 

 under the cuticle white, the earlier whorls white or delicate pink. 



Macahe, Brazil (Paz, Martinez). 



Bulimus chionostoma MORCH, Catal. Yoldi, (1852), p. 27 (no 

 description; refers to " Variat rarior peristomate albo" Pfr., Mon- 

 ogr. ii. p. 20). B. ovatus var. chionostomus MART., Novit. Conch, v, 

 p. 15. 



I cannot follow von Martens in quoting here Ferussac's plate 160, 

 f. 11, 12, without a "?". Those figures are by no means typical 

 chionostomus. A number of specimens of this white-mouthed variety 



